- kill-joy
- nspoilsport, damper, Sl. partypooper, wet blanket, grouch, Inf. sourpuss, malcontent; cynic, pessimist, gloom and doomer, Inf. gloomy Gus, Sl. crapehanger; nihilist, negativist, defeatist; worrywart, prophet of doom, Cassandra; scowler, sneerer, snarler, growler, grumbler; critic, complainer, faultfinder, detractor; scoffer, satirist, carper, caviler, Inf. knocker; skeptic, nullifidian, doubter.
A Note on the Style of the synonym finder. 2014.